Feeding device for envelope or bag making machines



7 Nov; 8, 1927. 1,648,769

T. HUGO FEEDING DEVICE FOR ENVELOPE OR BAG MAKING MACHINES Filed June 4, 1925 5 Sheets-Sheet 1 Nov. 8, 1927.

' T. HUGO FEEDING DEVICE FOR ENVELOPE OR BAG MAKING MACHINES Filed June 4, 1925 3 Sheets-Sheet 2 hll Nov. 8, 1927.

T. HUGO FEEDING DEVICE FOR ENVELOFE OR BAG MAKING MACHINES Filed June 4, 1925 3 Sheets-Sheet 3 Patented Nov. 8, 1927.

UNITED STATES THEODOR HUGO, 0F WILMERSDORF, NEAR BERLIN, GERMANY.

FEEDING DEVICE FOR ENVELOPE OR BAG MAKING MACHINES.

Application filed June 4, 1925, Serial No.

This inventionrelates to an envelope or bag making machine of the type in which a paper ribbon or sheet is continuously fed as from a roll.

In order that the advantages of the continuous uniform feed of the ribbon should not be lost'by the stop operation necessary in a machine of this kind, according to the pres ent invention only that part of the ribbon is stopped which is immediately in front of the cutting device,'while the rest of the ribbon is fed uninterruptedly.

Due to the continuous advance of the ribbon toward the stopping position, a loop is constantly formed in the paper, which must be straightened before theneXt stamping act. The straightening of the paper loop at the correct time and "into the correct feeding plane can only be effected by the elasticity of the paper itself without'the' aid of'mechanr cal means in the case of strong paper-when formed into short loops. In weak papers and more particularly with large loops, the

ribbon must be straightened and the cut-off blanks conveyed to the cutting and stamping device by mechanical means essentially com prising a movable supporting plate and feed-. ing rolls which have accelerated movement, and it is in this connectionthat the present invention has special application.

The accompanying drawings represent a feeding device constructed according to the invention and therein:

Fig. 1 is a central longitudinal sectional View with'the loop-supporting plate in normal position.

Fig. 2 is a view similar to Fig. 1 but with said plate in loop-supporting position.

Fig. 3 is a plan of the device.

Fig. 4: is .a front elevationof the cutting and stamping apparatus.

Fig. 5 is a plan of the latter device showing the presser and a portion ofthe. paper ribbon.

Fig. 6 is a fragmentary plan view which shows the cutting and stamping device with. the upper blades removed. I

Fig. 7 is an enlarged longitudinal sectional detail showing the releasable feed roll mechaniism in positions corresponding to Fig. 1, an

Fig. 8 is a view of the arts of Fig. 7 in positions corresponding to ig. 2. The paper ribbon or sheet 1 as drawn from a roll or otherwise (not shown) is provided with gummed corners 1, (Figs. '3, 5

34,938, and in Germany April 24, 1925.

and 6) said sheet is led b rollers 4 and 5 rotatable about pins 2 an- 3 over a guide roller 6 'andthen by feed rolls 7, 8; 9, l0; and 11, 12 and under a-pressure 13 in the no direction shown by the arrow to the position 14 at which the cutting and stamping devices (Figs, 4-6) are arranged. The pairs of feed rollers 7, 8; 9, 10; and 11, 12 are suitably driven from the machine so that the paper 05 ribbon 1 is fed uninterruptedly at a uniform speed in the direction of the arrow. The feed rollers8 and 10 are pressed by means of a lever system under the action of springs 15 on the rollers 7 or 9, so that the feed is 0 effected uniformly and efliciently.

As soon as the ribbon 1 has been advanced under the presser 13 so that a definite portion has arrived under the cutting and stamping device (Figs. 4=-6) at position 14, the vpresser 13 descends on the ribbon through the action of a two-armed lever 17 rotatable about its pivot 16 and driven by 'me'ans of a rod 18 from a cam provided on "the machine. The feed of that portion of so the ribbon which is behind the presser 13 is thus stopped, so that the rest of the ribbon alone is atthat moment moving to-.

wards the presser. At the moment when Presser 13 descends on the 'ribbon,'the roller 86' '12, which oscillates about the pivot 20 since it is carried by means of a two-armed lever 19, is raised from the paperby a rod 22 pivoted thereto at 21 and connected with a cam on the machine; the gear wheels 23 on such rollers 11 and 12 remaining in mesh. Since the paper or material is relatively thin, that used for instance being less than a millimeter, a very slight movement of roll 11 away'from roll 12 is'suificient to destroy transporting engagement of the rolls with the material, as best shown in Fig. 8. At. the same time, said movement is not suflicient to demesh the gear wheels 23. The roller 12 is rotated by sprocket wheels 24 and o 25'which are driven from the machine. The roller rotates, therefore, continually in the direction of the feeding movement of the paper and faster than such feeding move- 'ment.

The roller 12 tends as soon as it has descended and pressed on the ribbon to draw it tightly in the direction of movement. It cannot, however, feed the paper faster than isallowed by the pairs of feeding rollers 7, 8, 9, and 10. The feeding movementof the roller 12 is aided by the roller 11 which is 11, 12 occurs on the descending engagement of the roller 12 with the paper at the moment in which the presser 13 releases the for further advance in the direction shown by the arrow. Atthe moment in which the presser 13 descending on the paper holds it stationary, a loop] begins to form in the paper (Fig. 2) since the rollers 7, 8,9 and 10 move the ribbon forward uninterruptedly towards the presser. The loop is guided by means of a supporting plate 27 pivoted at 26 which is raised and lowered by means of a system of levers 2832 under the action of a rod 33 operated by .the machine, the paper always lying on the upper surface of .the plate 27, the movement transmitted from the rod 33 to the plate 27 taking place exactly at the time in which the loop is being formed and inthe same direction. As soon as the loop has been formed, that is, at the end of the halt of that part ofthe paper which is held under the presser 13, the plate 27 is in its highest position. At this moment which coincides with the end of the cutting and stamping of the portion of the ribbon projecting beyond the presser 13, the

. latter rises and releases the paper, and

allows it to move again in the direction of the arrow. As the roller 12 descends on the ribbon 1 and on the roller 11, the plate 27 again returns" to the horizontal position '(Fig. 1

At the time of the descent of the plate 27,

the roller 12, rotating somewhat faster than the ribbon, straightens and feeds it under the presser 13 towards the cutting devices at the position 14. Thus the paper is taut and always under tension during the formation of the loop and is thereby secured from any kind of displacement or retardation. Also, the cut blanks are always reliably fed towards the stamping and'cutting device at the right time, since the move ment is positively effected, so that the same length of paper is always stamped and cut ofi with correctly defined edges. v

For assisting the tension ex'ertedby the rollers 11 and 12, other pairs of rollers of this type which act in the same manner and are actuated in succession can be arranged in combination ,with the plate 27, so that their pull comesinto action during the descent of the plate 27.

Means other thanthe descending rollers described'above can be employed forstraightening the loop. For example, both rollers may be fixedand; one roller provided with a portion excised from its circumference, so

that, temporarily, the paper ribbon is not advanced by the roller. In this case the rollers need not be lifted.

The knives-of the locally fixed cutting and sliding in vertical guides 39, 40 and actuated by a lower transverse member 42 which paper or ribbon, previously held stationary,,is operated from the machine by a rod 43.

The upper blades slide against correspondingly formed stationary lower blades 44.

The accurate sliding of the upper blades rel- A knives and the stamping device are shown with the cutting edge 34 and the parts 3538 to be stamped out, the upper member-41 being removed. The part 49 in the line of the cutting edge of the blade 34 is cut off at the same time by the blade 34 which is provided with a correspondingly formed punch.

I claim:

prising means to feed material, means to pcriodically arrest the feed of the material past one position in its path of travel where:

material during the forming and receding of the loops, and means to feed the loops at an I 1. A machine bf the class described, com-' means to engage accelerated rate during the intervalsof release of the material by the first-mentioned means.

2. A machine of the class described, comprising means to feed material, means to pcriodically arrest the feed of the material past one position in its path of travel whereby continued feeding in the rear of said position will form loops in the material, a late of a length to support the. loops throng out, means to move said plate, said plate being adapted to engage and follow the loop-forming portions of the material during the forming" and receding of the loops, and means to feed the loops at an accelerated rate during the intervals of release of the materialby the first-mentioned. means.

3.-A machine of the class described, comprising means to feed material, means to periodically arrest the feed of the material past ..one position in its path of travel whereby continued feeding in the rear of said position will form loops in the material, a plate below the material of a length to support the loops throughout, means to rock said late, said plate being adapted to engage an follow the loop-forming portions of the material during the forming and receding of the loops, and means to feed the loops atan accelerated rate during the intervals of release of the material by the first-mentioned means.

4. A-machine of the class described, comprising means to feed material having rollers on opposite sides of the material, means to drive said rollers at an accelerated rate, ers from transporting engagementwith the 1 means to periodically arrest the feed of the material during the forming of the loops and material past one position in its path of reestablish such engagement after formation travel whereby continued feeding in the rear of theloo s and release thereof so that the 5 of said position will form loops in the mateaccelerate motion will cause the loops to rial, supporting means to engage and follow rapidly recede and be fed past said flgpsition. 1! the loop-forming portions of the material In testimony whereof I have a (1 my during the forming and receding of the signature; loops, and means operable to release said roll- I THEODOR HUGO. 

